JP7344938B2 - main stand - Google Patents

Description

The present invention relates to a main stand.

2. Description of the Related Art Conventionally, a saddle-ride type vehicle is sometimes provided with a swingable main stand that allows the vehicle body to stand on its own substantially vertically. For example, Patent Document 1 listed below discloses a stand that is pivotally supported on a body frame via a pivot shaft extending in the left-right direction so as to be swingable back and forth. This stand is composed of a stand cover supported on a pivot, and a stand main body welded to the rear surface of the stand cover, and the stand cover is rotatably supported elastically on the pivot. Specifically, the outer periphery of an annular rubber bushing is fixed to the inner surface of the boss portion formed on the stand cover by baking, and the collar fixed by baking to the inner periphery of this rubber bushing is rotatably supported on a pivot. There is.

Japanese Patent Application Publication No. 7-69255

However, in the conventional main stand, there is a possibility that water may enter the parts that slide during rocking, resulting in problems such as sticking.

Therefore, the present invention provides a main stand that can suppress water from entering the parts that slide during rocking.

The main stand of the present invention includes a shaft (70, 70A) supported by a vehicle body side part (50), and a sliding mechanism through which the shaft (70, 70A) is inserted and on which the shaft (70, 70A) slides. A connecting portion (90, 90A) in which a through hole (91) having a surface (92) is formed, and a connecting portion (90, 90A) that is arranged at intervals in the extending direction of the shaft (70, 70A) and that is connected to the through hole (91). A pair of seal members (65) closing a radial gap with the shaft (70, 70A).

According to the present invention, it is possible to seal the portion between the pair of seal members between the connecting portion and the shaft. Therefore, in the main stand in which the connecting portion is provided with a sliding surface, it is possible to suppress water from entering the portion that slides during rocking.

In the above main stand, the inner circumferential surface of the through hole (91) has an annular first ring whose diameter is larger than that of the sliding surface (92) and in which each of the pair of seal members (65) is disposed. A groove (94) may be formed.

According to the present invention, it is possible to suppress the seal member from shifting in the extending direction of the shaft. That is, when inserting the shaft into the through hole of the connection part, the sealing member interposed between the connection part and the shaft can be kept in a predetermined position. Therefore, it is possible to prevent insufficient closing of the radial gap between the through hole and the shaft due to the positional shift of the seal member.

In the above main stand, an annular second groove (75) in which each of the pair of seal members (65) is disposed may be formed on the outer peripheral surface of the shaft (70A).

According to the present invention, it is possible to suppress the seal member from shifting in the extending direction of the shaft. That is, when inserting the shaft into the through hole of the connection part, the sealing member interposed between the connection part and the shaft can be kept in a predetermined position. Therefore, it is possible to prevent insufficient closing of the radial gap between the through hole and the shaft due to the positional shift of the seal member. Furthermore, the grooves can be formed more easily by cutting than in the case of forming grooves on the inner circumferential surface of the connecting portion.

The main stand further includes a pair of legs (61) extending from the connecting portion (90, 90A), and the pair of sealing members (65) are arranged in the extending direction of the shaft (70, 70A). The coupling portion (93) between the connection portion (90, 90A) and the pair of leg portions (61) may be sandwiched therebetween.

According to the present invention, it is possible to seal at least the connecting portion between the connecting portion and the pair of legs among the connecting portion and the shaft. Therefore, the interior of the connection portion can be sealed over a wide area.

In the above main stand, the connecting portion (90, 90A) may extend continuously between the connecting portions (93) with the pair of legs (61).

According to the present invention, since the connecting portion is a single member that connects to the pair of legs, in the main stand where the connecting portion can be provided with a wide sliding surface, water does not reach the part that slides during rocking. can effectively suppress the infiltration of

In the above main stand, the connecting portion (90, 90A) may be located closer to the rear wheel (3) than the crankshaft (42) of the engine (41).

According to the present invention, since the connection part is located near the rear wheels, the connection part can be exposed to water splashed up by the rear wheels when the vehicle is running, but the sealing member prevents water from sliding on the parts when the vehicle is rocking. can effectively suppress the infiltration of Furthermore, since the center of rotation of the main stand can be moved rearward from the center of gravity of the vehicle, the load shared on the main stand in the upright position can be reduced, and the operating load when raising the main stand can be reduced.

In the above main stand, the opening of the through hole (91) of the connecting portion (90, 90A) may be located below the power train (40) that drives the drive wheel (3).

According to the present invention, where water may fall from the lower surface of the power train into the opening of the through hole of the connection portion, the sealing member can effectively prevent water from entering into the portion that slides during rocking.

In the above main stand, the outer peripheral surface of the shaft (70, 70A) has a recess (74) recessed in the radial direction at a position inside the pair of seal members (65) in the extending direction. You can.

According to the present invention, the grease disposed between the sliding surface of the connecting portion and the outer circumferential surface of the shaft can be stored in the recess, and then the pair of seal members can prevent the grease from flowing out.

Advantageous Effects of Invention According to the present invention, it is possible to provide a main stand that can suppress water from entering the parts that slide during rocking.

FIG. 1 is a left side view of a motorcycle according to an embodiment. FIG. 2 is a left side view of the power train and main stand of the motorcycle shown in FIG. 1. FIG. FIG. 3 is a diagram showing the main stand of the first embodiment, and is a sectional view taken along the line III-III in FIG. 2. FIG. FIG. 3 is a right side view showing the bracket of the main stand. FIG. 4 is a cross-sectional view corresponding to FIG. 3, showing the main stand of the second embodiment.

Embodiments of the present invention will be described below based on the drawings. In the following description, components having the same or similar functions are given the same reference numerals. Further, redundant explanations of these configurations may be omitted. In addition, directions such as front, rear, top, bottom, left, and right in the following description are the same as directions in the vehicle described below. That is, the up-down direction coincides with the vertical direction, and the left-right direction coincides with the vehicle width direction. Further, in the figures used in the following explanation, arrow UP indicates upward, arrow FR indicates forward, and arrow LH indicates left.

<Overall configuration of vehicle>
FIG. 1 is a left side view of the motorcycle according to the embodiment.
As shown in FIG. 1, the motorcycle 1 of this embodiment is a saddle-ride type vehicle. The motorcycle 1 is a scooter-type vehicle having a step floor 5 on which a rider seated on a seat 4 rests his or her feet. The motorcycle 1 includes a front wheel 2, a rear wheel 3, a body frame 20, a vehicle cover 30, a power train 40, and a main stand 60.

The front wheel 2 is pivotally supported by the lower end portions of a pair of left and right front forks 11 of a front wheel suspension system 10. The front wheel suspension system 10 is supported at the front end of the vehicle body frame 20 so as to be steerable. A bar handle 12 for steering is attached to the upper part of the front wheel suspension system 10.

The vehicle body frame 20 includes a head pipe 21, a down frame 22, a lower frame 23, and a rear frame 24, which are integrally joined by welding or the like. The head pipe 21 is arranged at the front end of the vehicle body frame 20. The down frame 22 is coupled to the head pipe 21. The down frame 22 extends downward from the head pipe 21. A pair of lower frames 23 are provided on the left and right. The lower frame 23 is coupled to the lower end of the down frame 22. The lower frame 23 extends rearward from the lower end of the down frame 22. A pair of rear frames 24 are provided on the left and right. The rear frame 24 is coupled to the rear end of the lower frame 23. The rear frame 24 extends upward and rearward from the rear end portions of the pair of lower frames 23. A pair of rear frames 24 support the seat 4.

The vehicle cover 30 forms the outer shell of the vehicle. The vehicle cover 30 includes a front cover 31, a handle cover 32, a leg shield 33, a lower cover 34, and a rear cover 35. The front cover 31 is provided to cover the head pipe 21. The handle cover 32 is provided to cover the center portion of the bar handle 12. The leg shield 33 is provided to cover the down frame 22 and to cover the driver's legs from the front. The lower cover 34 is provided to cover the lower frame 23. A step floor 5 is formed on the upper surface of the lower cover 34 on which a passenger puts his or her feet. The rear cover 35 extends rearward and upward from the lower cover 34. The rear cover 35 is provided to cover the rear frame 24 from the front and from the outside in the vehicle width direction. The seat 4 is arranged above the rear cover 35. The vehicle cover 30 is composed of a plurality of exterior panels, and the plurality of exterior panels do not need to be divided into each part as described above, and may be arranged so as to straddle the boundaries of each part. , each part may be constituted by a plurality of exterior panels.

The power train 40 is a so-called unit swing type rear suspension. The power train 40 drives the rear wheels 3, which are drive wheels. The power train 40 is supported by the vehicle body frame 20 so as to be vertically swingable. The power train 40 is arranged from the front of the rear wheel 3 to the left side of the rear wheel 3.

FIG. 2 is a left side view of the power train and main stand of the motorcycle shown in FIG. 1.
As shown in FIG. 2, the power train 40 integrally includes an engine 41 and a power transmission mechanism 46 that transmits the output of the engine 41 to the rear wheels 3.

For example, the engine 41 is a single-cylinder engine with a crankshaft 42 extending along the vehicle width direction. Engine 41 includes a crankcase 43 and a cylinder 44. The crankcase 43 houses the crankshaft 42. The cylinder 44 projects forward from the front end of the crankcase 43. A piston is slidably disposed within the cylinder 44 . The reciprocating movement of the piston causes the crankshaft 42 to rotate. The output of the engine 41 is transmitted from a crankshaft 42 to the rear wheels 3 via a power transmission mechanism 46.

The power transmission mechanism 46 transmits the rotational power of the crankshaft 42 to the axle of the rear wheel 3. The power transmission mechanism 46 includes a transmission, a centrifugal clutch, a driven shaft, and a speed reduction mechanism. For example, the transmission is a V-belt continuously variable transmission. The centrifugal clutch transmits the output of the transmission to the driven shaft when the rotational speed of the crankshaft 42 exceeds a predetermined value. The deceleration mechanism decelerates the rotation of the driven shaft and transmits the deceleration to the axle of the rear wheel 3. In this way, the rotational power of the crankshaft 42 is transmitted to the axle via the transmission, centrifugal clutch, driven shaft, and deceleration mechanism, thereby driving the rear wheels 3 supported by the axle and driving the vehicle.

A transmission case 47 is connected to the left side of the crankcase 43. The transmission case 47 forms the exterior body of the power train 40 together with the crank case 43. Transmission case 47 houses power transmission mechanism 46 . The transmission case 47 includes an inner case that forms an inner side of the transmission case 47 in the vehicle width direction, and an outer case 49 that forms an outer side of the transmission case 47 in the vehicle width direction. The inner case is integrally formed with the crankcase 43. The inner case is formed into a box shape that extends in the front-rear direction and opens outward in the vehicle width direction. The outer case 49 is formed into a box shape that extends in the front-rear direction and opens inward in the vehicle width direction.

FIG. 3 is a diagram showing the main stand of the first embodiment, and is a sectional view taken along line III-III in FIG. 2.
As shown in FIGS. 2 and 3, a pair of stand brackets 50 are formed on the exterior body of the power train 40. In this embodiment, the pair of stand brackets 50 are provided on the crankcase 43. The pair of stand brackets 50 are arranged at intervals in the vehicle width direction. Stand bracket 50 projects downward from crankcase 43. The pair of stand brackets 50 are provided below the transmission case 47 when viewed from the side in the vehicle width direction. The pair of stand brackets 50 are arranged so as to overlap each other in a side view. A main stand 60 is connected to the pair of stand brackets 50. Each stand bracket 50 includes a through portion 51 through which the shaft 70 of the main stand 60 is inserted. The penetrating portion 51 penetrates each stand bracket 50 in the vehicle width direction.

<Main stand of the first embodiment>
As shown in FIG. 3, the main stand 60 is rotatably supported at the bottom of the vehicle body. The main stand 60 has a pair of left and right legs 61, and has two positions: an upright position where the pair of legs 61 are in contact with the ground and the rear wheels 3 are floating, and the vehicle body stands up substantially vertically; oscillates between a retracted position and a retracted position. The main stand 60 includes a shaft 70 supported by a component on the vehicle body side, a bracket 80 coupled to the shaft 70, a connecting portion 90 connecting the leg portion 61 and the shaft 70, and a connecting portion 90 between the leg portion 61 and the connecting portion 90. and a coupled gusset 63. Note that the main stand 60 in the following description is assumed to be in the retracted position shown in each figure unless otherwise specified.

The shaft 70 is formed into a cylindrical shape. The shaft 70 extends in the vehicle width direction. The shaft 70 is supported by a pair of stand brackets 50. The shaft 70 is inserted through the penetration portions 51 of the pair of stand brackets 50. The shaft 70 is disposed such that both end portions protrude further outward than the pair of stand brackets 50 in the vehicle width direction. The outer peripheral edge of the left end surface of the shaft 70 is chamfered. A pin hole 71 into which a split pin is inserted to prevent the shaft 70 from coming off passes through the left end portion of the shaft 70 . A bracket 80 is fixedly coupled to the right end of the shaft 70. The shaft 70 includes a pair of insertion parts 72 arranged inside the penetration part 51 of the stand bracket 50 and a sliding part 73 arranged inside the connection part 90.

The insertion portion 72 has an outer circumferential surface that has a constant outer diameter and extends in the vehicle width direction. The insertion section 72 is supported by the penetration section 51 of the stand bracket 50 via a collar 54 attached to the outer peripheral surface of the insertion section 72 . The sliding part 73 is located between the pair of insertion parts 72. A recess 74 recessed in the radial direction is formed on the outer circumferential surface of the sliding portion 73. The depression 74 is formed in the center of the sliding portion 73. The recesses 74 are formed at intervals in the vehicle width direction with respect to the outer peripheral surface of each insertion portion 72. The outer peripheral surface of the shaft 70 extends with a constant outer diameter except for the recess 74. That is, both side portions of the outer circumferential surface of the sliding portion 73 adjacent to the recess 74 in the vehicle width direction extend continuously from the outer circumferential surface of the insertion portion 72 with a constant outer diameter.

FIG. 4 is a right side view showing the bracket of the main stand.
As shown in FIGS. 3 and 4, the bracket 80 is arranged on the outer side of the right stand bracket 50 in the vehicle width direction. Bracket 80 is arranged along stand bracket 50. The bracket 80 is formed into a flat plate shape that is thick in the vehicle width direction. The bracket 80 includes a connecting pin 81 and an engaging portion 82. The connection pin 81 projects outward in the vehicle width direction. The connecting pin 81 is disposed offset from the shaft 70 when viewed from the side. One end of a return spring is connected to the connection pin 81. The engaging portion 82 is a notch that penetrates the bracket 80 in the vehicle width direction and is open at the edge of the bracket 80. An engagement pin 52 that protrudes outward in the vehicle width direction from the stand bracket 50 is arranged inside the engagement portion 82 . The bracket 80 makes the shaft 70 unrotatable with respect to the stand bracket 50 because the engagement portion 82 engages with the engagement pin 52 .

As shown in FIG. 3, the connecting portion 90 is arranged between the pair of stand brackets 50. The entire connecting portion 90 is located below the power train 40. The connecting portion 90 is located closer to the rear wheel 3 than the crankshaft 42 of the engine 41 (see FIG. 2). The connecting portion 90 is formed into a cylindrical shape with both ends open. The connecting portion 90 extends in the vehicle width direction. The inner side of the connecting portion 90 is a through hole 91 through which the shaft 70 is inserted. The through hole 91 has a sliding surface 92 on which the shaft 70 slides. Grease may be placed between the sliding surface 92 and the outer peripheral surface of the sliding portion 73 of the shaft 70. The openings at both ends of the through hole 91 are located below the crankcase 43, and overlap the crankcase 43 when viewed from below. The connecting portion 90 is coupled to the pair of legs 61. The connecting portions 90 are coupled to the leg portions 61 at locations separated from each other in the vehicle width direction. The connecting portion 90 extends continuously between the connecting portions 93 with the pair of legs 61 . That is, a single connecting portion 90 is coupled to the pair of legs 61.

The pair of leg portions 61 extend rearward from the joint portion with the connecting portion 90 in a side view. The pair of leg portions 61 are arranged to sandwich the rear wheel 3 from the outside in the vehicle width direction. The rear ends of the legs 61 touch the ground when the main stand 60 is in the upright position. The leg portion 61 is formed into a cylindrical shape. The front end of the leg portion 61 is closed by a connecting portion 90. That is, the inside of the leg portion 61 does not communicate with the inside of the connecting portion 90. The other end of the return spring is connected to the right leg 61. An operating arm 62 that is stepped on when swinging the main stand 60 from the storage position to the standing position is coupled to the left leg 61 (see FIG. 2).

The gusset 63 is formed into a plate shape. The gusset 63 is provided to cover the front portion of each leg portion 61 and the connecting portion 90 from below. The gusset 63 is welded to the pair of legs 61 and the connecting portion 90 to increase the rigidity of the main stand 60.

The main stand 60 further includes a pair of seal members 65 that close a radial gap between the through hole 91 of the connecting portion 90 and the shaft 70. The seal member 65 is formed in an annular shape. The seal member 65 is made of an elastic member such as rubber. The seal member 65 is interposed between the outer circumferential surface of the shaft 70 and the inner circumferential surface of the connecting portion 90 . The seal member 65 is in close contact with the outer circumferential surface of the insertion portion 72 of the shaft 70 and the inner circumferential surface of the connecting portion 90 over the entire circumference. The pair of seal members 65 are arranged at intervals in the vehicle width direction. The seal member 65 is in close contact with a portion of the outer circumferential surface of the sliding portion 73 of the shaft 70 that is located on the outer side of the recess 74 in the vehicle width direction. The pair of sealing members 65 are provided so as to sandwich the joint portion 93 of the connecting portion 90 with the pair of leg portions 61 in the vehicle width direction.

Here, a pair of annular grooves 94 (first grooves) in which one seal member 65 is arranged is formed on the inner peripheral surface of the through hole 91 of the connecting portion 90. The groove 94 is formed at a position facing the sliding portion 73 of the shaft 70. The groove 94 has a larger diameter than the sliding surface 92. The groove 94 is formed at a position slightly inside the end of the connecting portion 90 in the vehicle width direction.

As described above, according to the main stand 60 of the present embodiment, the pair of seal members 65 arranged at intervals in the vehicle width direction are arranged in the radial direction between the through hole 91 of the connecting portion 90 and the shaft 70. Since the gap is closed, the portion between the pair of seal members 65 between the connecting portion 90 and the shaft 70 can be sealed. Therefore, in the main stand 60 in which the sliding surface 92 is provided on the connecting portion 90, it is possible to suppress the intrusion of water into the portion that slides during rocking.

Furthermore, an annular groove 94 in which the seal member 65 is disposed is formed in the inner peripheral surface of the through hole 91 . According to this configuration, it is possible to suppress the seal member 65 from shifting in the vehicle width direction. That is, when inserting the shaft 70 into the through hole 91 of the connecting portion 90, the sealing member 65 interposed between the connecting portion 90 and the shaft 70 can be kept in a predetermined position. Therefore, it is possible to prevent insufficient closing of the radial gap between the through hole 91 and the shaft 70 due to the positional shift of the seal member 65.

The pair of seal members 65 are provided so as to sandwich the joint portion 93 between the connecting portion 90 and the pair of leg portions 61 in the vehicle width direction. According to this configuration, at least the joint portion 93 between the connecting portion 90 and the pair of legs 61 can be sealed between the connecting portion 90 and the shaft 70 . Therefore, the interior of the connecting portion 90 can be sealed over a wide area.

The connecting portion 90 extends continuously between the connecting portions 93 with the pair of legs 61 . According to this configuration, the connecting portion 90 becomes a single member connected to the pair of legs 61, so that the sliding surface 92 can be provided over a wide range on the connecting portion 90 in the main stand 60. It can effectively suppress water intrusion into areas where water is exposed.

The connecting portion 90 is located closer to the rear wheel 3 than the crankshaft 42 of the engine 41 . According to this configuration, since the connecting portion 90 is located close to the rear wheel 3, the connecting portion 90 may be exposed to water splashed up by the rear wheel 3 when the vehicle is running, but the sealing member 65 described above prevents the connecting portion 90 from being exposed to water splashed up by the rear wheel 3 when the vehicle is running. Water intrusion into sliding parts can be effectively suppressed. Furthermore, since the center of rotation of the main stand 60 can be moved rearward from the center of gravity of the vehicle, the load shared on the main stand 60 in the upright position can be reduced, and the operating load when raising the main stand 60 can be reduced. Can be done.

The opening of the through hole 91 of the connecting portion 90 is located below the power train 40. According to this configuration, where water may fall from the lower surface of the power train 40 into the opening of the through hole 91 of the connection portion 90, the above-described seal member 65 effectively prevents water from entering into the portion that slides during rocking. can be suppressed to

The outer peripheral surface of the shaft 70 has a recess 74 inside the pair of seal members 65 in the vehicle width direction. According to this configuration, the grease disposed between the sliding surface 92 of the connecting portion 90 and the outer peripheral surface of the sliding portion 73 of the shaft 70 is stored in the recess 74, and then the grease is removed by the pair of seal members 65. Outflow to the outside can be suppressed.

The bracket 80 is formed with a notched engagement portion 82 that engages with the engagement pin 52 protruding from the stand bracket 50. If the main stand is operated with the connecting portion and shaft of the main stand fixed to each other, the engaging pin on the stand bracket side is likely to be damaged if the engaging portion is a through hole. In other words, parts on the power train 40 side may be damaged. According to this embodiment, since the engaging portion 82 is a notch, the bracket 80 is more likely to be damaged than when the engaging portion is a through hole. Therefore, even if the main stand 60 is operated in a fixed state, the parts that are damaged can be replaced more easily.

<Main stand of second embodiment>
Next, with reference to FIG. 5, the main stand of the second embodiment will be described. The main stand 60A of the second embodiment is different from the first in that the groove 94 is not formed in the connecting portion 90A, and the sealing member 65 is arranged in a groove 75 (second groove) formed in the shaft 70A. Different from the embodiment. Note that the configuration other than that described below is the same as that of the first embodiment.

FIG. 5 is a diagram showing the main stand of the second embodiment, and is a sectional view corresponding to FIG. 3.
As shown in FIG. 5, a pair of annular grooves 75 in which one seal member 65 is disposed is formed on the outer peripheral surface of the sliding portion 73 of the shaft 70A. The groove 75 is formed at a position facing the sliding surface 92 of the connecting portion 90A. The pair of grooves 75 are positioned so as to sandwich the depression 74 therebetween. The pair of grooves 75 are formed at positions slightly inward in the vehicle width direction from the outer end of the sliding portion 73 in the vehicle width direction.

According to the main stand 60A of the present embodiment described above, in addition to the effects similar to those of the first embodiment, the following effects are achieved.
In this embodiment, since the annular groove 75 in which each of the pair of seal members 65 is disposed is formed on the outer peripheral surface of the shaft 70A, the groove 94 is formed on the inner peripheral surface of the connecting portion 90 as in the first embodiment. The groove 75 can be formed more easily by cutting than when forming the groove 75 .

Note that the present invention is not limited to the above-described embodiments described with reference to the drawings, and various modifications can be made within the technical scope thereof.
For example, in the embodiment described above, an example is shown in which the present invention is applied to a scooter-type motorcycle, but the scope of application of the present invention is not limited to motorcycles. For example, the present invention can be applied to all vehicles that are equipped with a main stand (center stand) that allows the vehicle body to stand on its own. In other words, the present invention is applicable not only to scooter-type motorcycles, but also to other motorcycles, tricycles, and the like. Further, in the above embodiment, the motorcycle 1 is an engine vehicle, but the present invention is also applicable to an electric vehicle equipped with a motor as a power source.

Further, in the above embodiment, the main stand 60 is supported by the power train 40, but the main stand may be supported by a component on the vehicle body side. For example, the main stand may be supported by a power train such as an engine provided separately from the rear suspension, or may be supported by the vehicle body frame.

Further, in the above embodiment, the single connecting portions 90, 90A are connected to the pair of legs 61, but the configuration is not limited to this. The main stand may have a pair of connection parts, one connected to each leg. Even in this case, the above-described effects can be achieved because each connection portion has the same configuration as in the embodiment described above.

In addition, without departing from the spirit of the present invention, the components in the embodiments described above can be replaced with well-known components as appropriate, and the embodiments and modifications described above may be combined as appropriate.

3... Rear wheel (drive wheel) 40... Power train 41... Engine 42... Crankshaft 50... Stand bracket (body side part) 60, 60A... Main stand 61... Leg 65... Seal member 70, 70A... Shaft 74... Hollow 75...Groove (second groove) 90, 90A...Connection part 91...Through hole 92...Sliding surface 93...Joining part 94...Groove (first groove)

Claims (8)

a shaft (70, 70A) supported by the vehicle body side part (50);
a connecting portion (90, 90A) formed with a through hole (91) having a sliding surface (92) through which the shaft (70, 70A) is inserted and on which the shaft (70, 70A) slides;
a pair of seal members (65) arranged at intervals in the extending direction of the shaft (70, 70A) and closing a radial gap between the through hole (91) and the shaft (70, 70A);
Equipped with
The pair of sealing members (65) are arranged at a position inside the end of the connecting portion (90, 90A) in the extending direction.
main stand. On the inner peripheral surface of the through hole (91),
An annular first groove (94) is formed whose diameter is larger than that of the sliding surface (92) and in which each of the pair of seal members (65) is disposed.
The main stand according to claim 1. On the outer peripheral surface of the shaft (70A),
An annular second groove (75) is formed in which each of the pair of seal members (65) is disposed;
The main stand according to claim 1 or claim 2. Further comprising a pair of legs (61) extending from the connecting portion (90, 90A),
The pair of sealing members (65) are configured to sandwich the connecting portion (93) between the connecting portion (90, 90A) and the pair of leg portions (61) in the extending direction of the shaft (70, 70A). is provided in
The main stand according to any one of claims 1 to 3. The connection portion (90, 90A) is
extending continuously between the connecting portion (93) with the pair of legs (61);
The main stand according to claim 4. The connection portion (90, 90A) is located closer to the rear wheel (3) than the crankshaft (42) of the engine (41).
The main stand according to any one of claims 1 to 5. The opening of the through hole (91) of the connecting portion (90, 90A) is located below the power train (40) that drives the drive wheel (3).
The main stand according to any one of claims 1 to 6. The outer peripheral surface of the shaft (70, 70A) has a recess (74) recessed in the radial direction at a position inside the pair of seal members (65) in the extending direction.
The main stand according to any one of claims 1 to 7.

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